C = 1/42 + 1/30 + 1/20 + 1/12 + 1/6 + 1/2
C = 1/2 + 1/6 + 1/12 + 1/20 + 1/30 + 1/42
C = 1/1x2 + 1/2x3 + 1/3x4 + 1/4x5 + 1/5x6 + 1/6x7
C = 1 - 1/2 + 1/2 - 1/3 + 1/3 - 1/4 + 1/4 - 1/5 + 1/5 - 1/6 + 1/6 - 1/7
C = 1 - 1/7
C = 6/7
Ủng hộ mk nha ^_-
tính nhanh: 1/2+1/6+1/12+1/20+1/30+1/42
tính nhanh:
1/2+1/6+1/12+1/20+1/30+1/42
Tính nhanh:
1/2+1/6+1/12+1/20+1/30+1/42
Tính nhanh
1/2+1/6+1/12+1/20+1/30+1/42
tính nhanh : B = 1/2 + 1/6 + 1/12 + 1/20 + 1/30 + 1/42 + .... + 1/110
1/2+1/6+1/12+1/20+1/30+1/42 tính nhanh mình cần gấp
Tính nhanh
\(\dfrac{1}{2}+\dfrac{1}{6}+\dfrac{1}{12}+\dfrac{1}{20}+\dfrac{1}{30}+\dfrac{1}{42}\)
Tính nhanh :
1/2 + 1/6 + 1/12 + 1/20 + 1/30 + 1/42
tính nhanh : 1/2 + 1/6 + 1/12 + 1/20 + 1/30 + 1/42
tích mình nhé
